This Microsoft article describes a way to check if a button is hidden on the command bar because of a rule.
To perform the check, append @ribbondebug=true to the Dynamics 365 URL.
Then when the record loads you’ll see a command called Command Checker on the command bar. You might need to click into the More commands icon to see the new command.
![Screen shot showing Command Checker on model-driven app command bar](https://wp.fkbase.info/wp-content/uploads/2021/10/Command-Checker.png)